This past trip (Oct 1-8) we witnessed several people holding up the fast pass return lines with "This is not a valid fastpass" tickets. It was the first time we had really encountered this. They were turned away but it took some time for the CMs to explain. We also waited behind GAC card holders who wanted to include more than 6 people in their group. Truly it's not a big deal to wait while the CM helps these people. It's a slight delay but once through you do zip through the line. I miss the days when you could return any time after your fast pass window had started. Ever since then, our trips have felt like the Amazing Race where the clock rules our day.